A New V‐Shaped Organic Fluorescent Compound Integrated with Crystallization‐Induced Emission Enhancement and Intramolecular Charge Transfer |
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| Authors: | Pei‐Yang Gu You‐Hao Zhang Gao‐Yan Liu Prof. Jian‐Feng Ge Prof. Qing‐Feng Xu Prof. Qichun Zhang Prof. Jian‐Mei Lu |
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| Affiliation: | 1. Department of Polymer Science, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 (P. R. China), Fax: (+86)?0512‐65880367;2. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 (Singapore), Fax: (+65)?67904705 |
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| Abstract: | The emission behavior of a new V‐shaped organic fluorescent compound (p,p′‐bis(2‐aryl‐1,3,4‐oxadiazol‐5‐yl)diphenyl sulfone ( OZA-SO ), consisting of diethylamino (donor) and sulfone (acceptor) units, has been studied in various polar solvents and with different morphologies. As expected, there is the gradual transition from the locally excited state to the intramolecular charge‐transfer (ICT) state with the increasing solvent polarity. The photoluminescence intensity of OZA-SO initially decreases with a low water fraction (fw), owing to ICT effect, and then increases with a high fw, owing to crystallization‐induced emission enhancement. At the same time, the fluorescence lifetime of OZA-SO increases from 0.062 ns in dimethylformamide (DMF) to 5.80 ns in a solution containing 90 % water, and then to 7.49 ns in a solution containing 60 % water. Furthermore, the solid‐state emission of OZA-SO can be tuned reversibly from green to yellow by fuming/grinding or fuming/heating owing to morphological changes. This color‐switchable feature of OZA-SO may have potential applications in optical‐recording and temperature‐sensing materials. |
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| Keywords: | charge transfer donor– acceptor systems fluorescence oxadiazoles sulfones |
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